body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

#canvas1{
    position: absolute;
    top: 50%;
    left:50%;
    transform: translate(-50%,-50%);
    border: 5px solid black;
    max-width: 100%;
    max-height: 100%;

}
img{
    display: none;
}


